Graft-modified ultrahigh-molecular-weight polyacrylamide and preparation method thereof

An ultra-high molecular weight, polyacrylamide technology, used in chemical instruments and methods, drilling compositions, etc., can solve problems such as poor oil displacement efficiency in temperature resistance, salt resistance and aging resistance, and achieve improved oil resistance. Effects of temperature and salt resistance, enhanced oil recovery, and increased three-dimensional network structure

Active Publication Date: 2014-01-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the technical problems to be solved by the present invention is that in the prior art, ultra-high molecular weight polyacrylamide is used in the field of tertiary oil recovery, and there are problems of temperature resistance, salt resistance, aging resistance and poor oil displacement efficiency. A New Graft Modified Ultra High Molecular Weight Polyacrylamide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Inject 0.15mol of sodium p-chlorophenolate and 7.8mol of ethylene oxide into the dry reaction bottle, and after reacting at 58°C for 8 hours, add 0.15mol of 2,2,6,6-tetramethyl-4-epoxypropyl Oxypiperidine-1-oxyl radical, continue to react at 80°C for 5 hours, add isopropanol to terminate the reaction, and precipitate with ether to obtain polyethylene oxide with a molecular weight of 2200 in the hydrophilic segment X -PEO-NO·. Add 0.10 mol of the functionalized polymer prepared above, 2.0 mol of styrene (St), and 0.10 mol of benzoyl peroxide into the reactor, pass nitrogen to remove oxygen, stir and mix evenly, and react at 100°C for 6 hours. A block copolymer with a hydrophobic segment molecular weight of 2000 was obtained X -PEO- b -PS. 0.10 g of the obtained copolymer and 2.55 g of ultra-high molecular weight polyacrylamide with a viscosity-average molecular weight of 28 million were dispersed in 95 g of aqueous sodium bicarbonate solution (pH=7.8) under strong sti...

Embodiment 2

[0034] Inject 0.15mol of sodium o-bromophenolate and 6.0mol of ethylene oxide into the dry reaction bottle, and after reacting at 55°C for 8 hours, add 0.15mol of 2,2,6,6-tetramethyl-4-epoxypropyl Oxypiperidine-1-oxyl radical, continue to react at 82°C for 5 hours, add isopropanol to terminate the reaction, and precipitate with ether to obtain polyethylene oxide with a molecular weight of 1600 in the hydrophilic segment X -PEO-NO·. Add 0.10mol and 1.5mol of p-methylstyrene (MSt) and 0.10mol of tert-butyl peroxide 2-ethylhexanoate to the reactor, pass nitrogen to remove oxygen, stir and mix well , reacted at 102°C for 6 hours to obtain a block copolymer with a molecular weight of 1700 in the hydrophobic segment X -PEO- b -PMS. 0.12 g of the obtained copolymer and 3.02 g of ultra-high molecular weight polyacrylamide with a viscosity-average molecular weight of 28 million were dispersed in 99 g of sodium bicarbonate aqueous solution (pH=9.6) under the action of strong stirring...

Embodiment 3

[0037] Inject 0.13mol sodium m-bromophenolate and 3.8mol propylene oxide into the dry reaction flask, and after reacting at 50°C for 10 hours, add 0.135mol 2,2,6,6-tetramethyl-4-epoxypropyloxy Piperidine-1-oxyl free radicals, continue to react at 80°C for 5 hours, add isopropanol to terminate the reaction, and precipitate with ether to obtain polyoxypropylene with a molecular weight of 1650 in the hydrophilic segment X -PPO-NO·. Add 0.10 mol of the functionalized polymer prepared above, 1.6 mol of styrene (St), and 0.11 mol of benzoyl peroxide into the reactor, pass nitrogen to remove oxygen, stir and mix evenly, and react at 110°C for 5 hours. A block copolymer with a molecular weight of 1600 in the hydrophobic segment was obtained X -PPO- b -PS. 0.15 g of the obtained copolymer and 4.02 g of ultra-high molecular weight polyacrylamide with a viscosity-average molecular weight of 32 million were dispersed in 102 g of aqueous sodium hydroxide solution (pH=8.5) under strong s...

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Abstract

The invention provides a graft-modified ultrahigh-molecular-weight polyacrylamide and a preparation method thereof, and mainly solves the problems of poor temperature tolerance, poor salt tolerance, poor aging resistance and low oil displacement efficiency of the ultrahigh-molecular-weight polyacrylamide in the prior art. The chemical general formula of the graft-modified ultrahigh-molecular-weight polyacrylamide is HPAM-g-R, wherein HPAM is ultrahigh-molecular-weight polyacrylamide, and R is selected from one of PEO-b-PS, PPO-b-PS, P(EO-r-PO)-b-PS, PEO-b-PPO-b-PS or PPO-b-PEO-b-PS; EO is epoxyethane, PO is propylene oxide, PEO is polyethylene oxide, PPO is polypropylene oxide, and PS is polyvinyl aromatic compound; and the viscosity-average molecular weight of the graft compound is greater than or equal to 29 million. The technical scheme provided by the invention solves the problems, and can be used for industrial production of polymer oil displacement agents and oil displacement of high-temperature high-salt oil reservoirs.

Description

technical field [0001] The invention relates to the field of tertiary oil recovery, in particular to a block-type activity controllable polymer graft-modified ultra-high molecular weight polyacrylamide and a preparation method thereof. Background technique [0002] The general performance requirements of water-soluble polymers in oil and gas field production mainly include: water solubility, viscosity increasing, suspension, shear thinning and thixotropy, stability and seepage characteristics to meet the requirements of oil and gas production engineering, etc. Although ultra-high molecular weight polyacrylamide can still enhance oil recovery at higher temperatures (such as 120°C) in an oxygen-free and divalent ion-free environment, water-soluble polymers commonly used in tertiary oil recovery still exist when they are used for oil displacement. many questions. For example, when the temperature is high, the hydrolysis of polyacrylamide is serious; when the formation temperat...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08F293/00C08G65/28C09K8/588
Inventor 于志省夏燕敏
Owner CHINA PETROLEUM & CHEM CORP
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